The Seagulls secured their place in the last eight of the competition following a 4-2 win against Burgess Hill Town on Wednesday, thanks to Bojan Radulovic’s brace and a goal each from Ben Wilson and Lorent Tolaj.
Meanwhile, the Rocks progressed to this stage after a 3-0 victory over Horsham YMCA last month to set up a repeat of last season’s semi-final tie between the two clubs.
Admission on the day of the game will be priced at £10 for adults and £5 for under-18s.